Results (PhD Chapter 2)

This series of files compile all analyses done during Chapter 2:

All analyses have been done with R 3.6.0.

Click on the table of contents in the left margin to assess a specific analysis.
Click on a figure to zoom it

To assess Section 1, click here.
To go back to the summary page, click here.

Human activities considered for the analyses:

Data is also available for the number of captured individuals for dogwhelk (Buccinum sp.), common crab (Cancer irroratus), snowcrab (Chinoecetes opilio), nordic shrimp (Pandalus borealis), arctic surfclam (Mactromeris polynyma) and american lobster (Homarus americanus) fisheries.

1. Exploration of relationships between parameters

This section explores relationships between each pair of parameters or AH distances.

Depth

OM

Gravel

Sand

Silt

Clay

CityInf

InduInf

DredColl

DredDump

MoorSite

RainSew

WastSew

CityWha

InduWha

2. Hierarchical Modelling of Species Communities

We will use the probabilities and indices of influences calculated in Section 1 here. The aim is to obtain predictive models for the benthic communities, based on the abiotic parameters and the human activities.

HMSC models have been developped in a dedicated script, and the R workspace has been imported here.

First, we initiate the HMSC model with the chosen data, priors and parameters.

Here are the diagnostics to evaluate the model’s quality.

Trace plots

Explanatory power

Confidence intervals

Credible intervals

Variance partitioning

Association networks

Finally, we can predict the values of our parameters within BSI.

Elliot Dreujou

2019-10-23